Hi, During a SysRq emergency remount Btrfs mounts are not remounted. I tracked the issue down to this line in do_emergency_remount() in fs/super.c: if (sb->s_root && sb->s_bdev && (sb->s_flags & MS_BORN) && !(sb->s_flags & MS_RDONLY)) s_bdev is NULL for Btrfs super blocks and subsequently do_remount_sb() is never called. I couldn't think of a solution, besides resorting to an ugly strcmp(sb->s_type->name, "btrfs"), without adding a field to struct super_block or similar changes. Thoughts?
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